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Antibacterial Thin-Film Nanocomposite Membranes Incorporated with Graphene Oxide Quantum Dot-Mediated Silver Nanoparticles for Reverse Osmosis Application
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-26 00:00:00 , DOI: 10.1021/acssuschemeng.9b00598 Li Yu 1, 2 , Wen Zhou 1, 2 , Yiming Li 1 , Quanzhu Zhou 1 , Haibo Xu 1 , Baoyu Gao 2 , Zhining Wang 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-26 00:00:00 , DOI: 10.1021/acssuschemeng.9b00598 Li Yu 1, 2 , Wen Zhou 1, 2 , Yiming Li 1 , Quanzhu Zhou 1 , Haibo Xu 1 , Baoyu Gao 2 , Zhining Wang 2
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The trade-off between selectivity and permeability as well as membrane biofouling are major limitations of thin-film composite (TFC) membranes. Graphene oxide quantum dot (GOQD) has aroused wide interest in membrane preparation because of the hydrophilic groups and one-atom-thick structure with lateral dimensions of 3–20 nm. GOQD could improve the permeability by providing additional water channels in membranes without compromising the selectivity. As an effective bactericidal material, silver nanoparticles (Ag) were uniformly deposited on GOQD by a facile method. The structure of the GOQD/Ag nanocomposite was verified by high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, attenuated total reflection Fourier transform infrared spectroscopy, and Raman spectroscopy. Subsequently, GOQD/Ag was embedded in the polyamide (PA) selective layer using an interfacial polymerization method to obtain thin-film nanocomposite (TFN-GOQD/Ag) membranes. The TFN membrane prepared at optimized conditions demonstrated a water flux of 39.1 L·m–2·h–1 and a NaCl rejection rate of 98.9% at 16 bar, reflecting a remarkable promotion in the flux (44.3%) compared with the pristine TFC membrane. Furthermore, owing to the synergistic effect of GOQD and Ag, the TFN-GOQD/Ag200 membrane possessed prominent bactericidal capacity against both Gram-negative Escherichia coli (98.6%) and Gram-positive Staphylococcus aureus (96.5%). The bactericidal mechanism was analyzed using a live/dead fluorescent imaging assay, scanning electron microscopy, morphology analysis, and reactive oxygen species detection. Furthermore, the bactericidal capacity of the TFN membrane was also measured via silver ion leaching and during extended practical application. This work demonstrates a new way to facilely prepare reverse osmosis membranes with prominent separation performance and excellent antibacterial and fouling resistance capacities.
中文翻译：
结合氧化石墨烯量子点介导的银纳米颗粒的抗菌薄膜纳米复合膜在反渗透中的应用
选择性和渗透性以及膜生物结垢之间的权衡是薄膜复合（TFC）膜的主要限制。氧化石墨烯量子点（GOQD）引起了人们对膜制备的广泛兴趣，因为其亲水基团和侧向尺寸为3–20 nm的单原子厚结构。GOQD可通过在膜中提供额外的水通道而不会损害选择性来提高渗透性。作为一种有效的杀菌材料，银纳米颗粒（Ag）通过一种简便的方法均匀地沉积在GOQD上。GOQD / Ag纳米复合材料的结构已通过高分辨率透射电子显微镜，X射线光电子能谱，衰减全反射傅里叶变换红外光谱和拉曼光谱进行了验证。随后，使用界面聚合方法将GOQD / Ag嵌入聚酰胺（PA）选择性层中，以获得薄膜纳米复合材料（TFN-GOQD / Ag）膜。在优化条件下制备的TFN膜的水通量为39.1 L·m–2 ·h –1和在16 bar下NaCl截留率为98.9％，与原始TFC膜相比，反映出通量显着提高（44.3％）。此外，由于GOQD和Ag的协同作用，TFN-GOQD / Ag200膜对革兰氏阴性大肠杆菌（98.6％）和革兰氏阳性金黄色葡萄球菌均具有突出的杀菌能力。（96.5％）。使用活/死荧光成像分析，扫描电子显微镜，形态分析和活性氧检测分析了杀菌机理。此外，还通过银离子浸出和在扩展的实际应用中测量了TFN膜的杀菌能力。这项工作展示了一种易于制备反渗透膜的新方法，该膜具有出色的分离性能以及出色的抗菌和防污能力。
更新日期：2019-03-26
中文翻译：
结合氧化石墨烯量子点介导的银纳米颗粒的抗菌薄膜纳米复合膜在反渗透中的应用
选择性和渗透性以及膜生物结垢之间的权衡是薄膜复合（TFC）膜的主要限制。氧化石墨烯量子点（GOQD）引起了人们对膜制备的广泛兴趣，因为其亲水基团和侧向尺寸为3–20 nm的单原子厚结构。GOQD可通过在膜中提供额外的水通道而不会损害选择性来提高渗透性。作为一种有效的杀菌材料，银纳米颗粒（Ag）通过一种简便的方法均匀地沉积在GOQD上。GOQD / Ag纳米复合材料的结构已通过高分辨率透射电子显微镜，X射线光电子能谱，衰减全反射傅里叶变换红外光谱和拉曼光谱进行了验证。随后，使用界面聚合方法将GOQD / Ag嵌入聚酰胺（PA）选择性层中，以获得薄膜纳米复合材料（TFN-GOQD / Ag）膜。在优化条件下制备的TFN膜的水通量为39.1 L·m–2 ·h –1和在16 bar下NaCl截留率为98.9％，与原始TFC膜相比，反映出通量显着提高（44.3％）。此外，由于GOQD和Ag的协同作用，TFN-GOQD / Ag200膜对革兰氏阴性大肠杆菌（98.6％）和革兰氏阳性金黄色葡萄球菌均具有突出的杀菌能力。（96.5％）。使用活/死荧光成像分析，扫描电子显微镜，形态分析和活性氧检测分析了杀菌机理。此外，还通过银离子浸出和在扩展的实际应用中测量了TFN膜的杀菌能力。这项工作展示了一种易于制备反渗透膜的新方法，该膜具有出色的分离性能以及出色的抗菌和防污能力。
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